Tetrasubstituted Olefins through the Stereoselective Catalytic Intermolecular Conjugate Addition of Simple Alkenes to α,β-Unsaturated Carbonyl Compounds
作者:Ki-Hyeok Kwon、Do W. Lee、Chae S. Yi
DOI:10.1002/anie.201006411
日期:2011.2.11
Branching out: The cationic ruthenium–hydride complex [Ru]+ was found to be a highly effective catalyst precursor for the conjugate addition of unactivated olefins to α,β‐unsaturated carbonylcompounds to yield tetrasubstituted olefins. A kinetic analysis provides support for the mechanism involving a regioselective olefin insertion and rapid alkene isomerization steps.
Scope and Mechanistic Study of the Coupling Reaction of α,β-Unsaturated Carbonyl Compounds with Alkenes: Uncovering Electronic Effects on Alkene Insertion vs Oxidative Coupling Pathways
作者:Ki-Hyeok Kwon、Do W. Lee、Chae S. Yi
DOI:10.1021/om201190v
日期:2012.1.9
intermolecular conjugate addition of simple alkenes to α,β-unsaturatedcarbonylcompounds to give (Z)-selective tetrasubstituted olefin products. The analogous coupling reaction of cinnamides with electron-deficient olefins led to the oxidative coupling of two olefinic C–H bonds in forming (E)-selective diene products. The intramolecular version of the coupling reaction efficiently produced indene and bicyclic fulvene
阳离子氢化钌络合物 [(C 6 H 6 )(PCy 3 )(CO)RuH] + BF 4 – ( 1 ) 被发现是简单烯烃与 α,β- 分子间共轭加成的高效催化剂。不饱和羰基化合物,得到( Z )-选择性四取代烯烃产物。肉桂酰胺与缺电子烯烃的类似偶联反应导致两个烯属C-H键氧化偶联,形成( E )-选择性二烯产物。偶联反应的分子内形式有效地产生了茚和双环富烯衍生物。肉桂酸乙酯与丙烯的偶联反应的经验速率定律确定如下:速率= k [ 1 ] 1 [丙烯] 0 [肉桂酸酯] -1。从 ( E )-C 6 H 5 CH=C(CH 3 ) CONHCH 3和 ( E )-C 6 H 5 CD=C测量到可忽略不计的氘动力学同位素效应 ( k H / k D = 1.1 ± 0.1) (CH 3 )CONHCH 3与苯乙烯。相反,从( E )-C 6 H 5 CH=C(CH 3 )CONHCH 3与苯乙烯和苯乙烯-d